Carburetor and CIE Fuel Metering

Why idling of SIE requires a rich mixture?

Why higher compression ratio is possible with gasoline direct injection system?

A two-stroke diesel engine of 13 cm bore, 15 cm stroke, compression ratio is 15 is running at 1800 rpm when the following measurements are made: Fuel flow = 7.3 kg/hr, inlet air temperature $= 21^{\circ}\text{C}$, exhaust pressure = 103 kPa, trapped air-fuel ratio = 0.04. Compute the scavenging efficiency.

Why idling of SIE requires rich mixture?

Differentiate between part fuel injection and gasoline direct injection. Which process is more advantageous?

A four stroke gasoline engine has a volumetric efficiency of 0.84. It has 12 cylinders, 150 mm bore, 200 mm stroke, and runs at 1500 rpm with indicated thermal efficiency of 0.30. The overall fuel-air ratio is 0.08 and density of air in the manifold is $0.82 \text{ kg/m}^3$. Compute the indicated mean effective pressure and indicated power. Heat of combustion = 42000 kJ/kg.

Why gasoline direct injection (GDI) system produces less knock and gives better volumetric efficiency?

What is meant by fuel metering in CI engine? Differentiate between individual pump system and common rail system.

Why the volumetric efficiency of IC engine decreases if the load is increased maintaining the speed constant?

Why idling of SIE requires a rich mixture?

What is nozzle? What are the functions of a nozzle in CIE?

A four stroke gasoline engine has a volumetric efficiency of $0.83$. It has 12 cylinders, $150\text{ mm}$ bore, $200\text{ mm}$ stroke and runs at $1500\text{ rpm}$ with indicated thermal efficiency of $0.31$. The overall fuel-air ratio is $0.08$ and density of air in the manifold is $0.81\text{ kg/m}^3$. Compute the indicated mean effective pressure and indicated power. Heat of combustion is $42000\text{ kJ/kg}$.